Los Angeles County ADU rules
Los Angeles County encompasses a remarkable mix of coastal communities, urban centers, established suburbs, foothill neighborhoods, and growing inland areas. Explore ADU resources and individual jurisdiction pages from across this diverse region.
Los Angeles County
County rules
California
Find the rules for your property
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Rules at a glance
- ADUs allowedAllowedConditions applyDetails
- Maximum sizeUp to 1,200 sqftConditions applyDetails
- HeightUp to 16 ftConditions apply · Also set at another levelDetails
- Side setbackAt least 4 ftConditions applyDetails
- Parking0 spacesConditions apply · Also set at another levelDetails
- Permit timelineUp to 15 daysDetails
- Short-term rentalsNot allowedDetails
Choose your city or area
Incorporated cities inside Los Angeles County adopt their own ADU standards, so a property inside city limits follows that city's rules. County standards apply to the unincorporated areas.
Detailed applicable rules
Rules are grouped by topic. Open a topic for the answers, the conditions on them, and the official source each one came from. Each rule names the authority that set it: Statewide standard and Los Angeles County standard.
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62 rules
What can I build?
The kinds of accessory dwelling unit this jurisdiction recognises.10 rules
Detached ADU allowed
AllowedDetached ADUs are authorized on the same lot as a proposed or existing primary dwelling.
- Set by: Statewide standard
- In force from: Effective
Explanation
Whether a detached, newly constructed ADU is permitted.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(3)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(3)
- Source checked
- August 23, 2026
Attached ADU allowed
AllowedAttached ADUs are authorized.
- Set by: Statewide standard
- In force from: Effective
Explanation
Whether an ADU attached to the primary dwelling is permitted.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(3)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(3)
- Source checked
- August 23, 2026
Conversion ADU allowed
AllowedExisting dwelling space and accessory structures, including garages, may be converted to ADUs.
- Set by: Statewide standard
- In force from: Effective
Explanation
Whether converting existing space, such as a garage or interior area, into an ADU is permitted.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(3)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(3)
- Source checked
- August 23, 2026
Junior ADU allowed
AllowedJADUs are authorized on qualifying single-family residential lots with a proposed or existing single-family residence.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Whether a junior ADU is permitted.
When this applies
Applies when all of the following are true:
Property primary structure type is Single family
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66333
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66333
- Source checked
- August 23, 2026
Maximum detached ADUs allowed
- Up to 2 count
Up to two detached ADUs are allowed with a multifamily residential building.
- Set by: Los Angeles County standard
- Note: Conditions apply
- Up to 1 count
One detached ADU is allowed on a lot with one proposed or existing single-family residence.
- Set by: Los Angeles County standard
- Note: Conditions apply
- Up to 2 count
A lot with a proposed multifamily dwelling may have up to two detached ADUs.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
- Up to 8 count
An existing multifamily lot may have up to eight detached ADUs, but no more than its existing dwelling-unit count.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
- Up to 1 count
One detached new-construction ADU is ministerially allowed on a qualifying single-family lot.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Los Angeles County standard
Greatest number of detached ADUs permitted on the property.
When this applies
Applies when all of the following are true:
Property primary structure type is Multifamily
Part of Los Angeles County Local Rules, published by Los Angeles County.
Explanation — Los Angeles County standard
Greatest number of detached ADUs permitted on the property.
When this applies
Applies when all of the following are true:
Property primary structure type is Single family
Part of Los Angeles County Local Rules, published by Los Angeles County.
Explanation — Statewide standard
Greatest number of detached ADUs permitted on the property.
When this applies
Applies when all of the following are true:
Property primary structure type is Multifamily
Property has existing primary dwelling is no
Part of Statewide, published by California.
Explanation — Statewide standard
Greatest number of detached ADUs permitted on the property.
When this applies
Applies when all of the following are true:
Property primary structure type is Multifamily
Property has existing primary dwelling is yes
Part of Statewide, published by California.
Explanation — Statewide standard
Greatest number of detached ADUs permitted on the property.
When this applies
Applies when all of the following are true:
Property primary structure type is Single family
Part of Statewide, published by California.
Source — Los Angeles County standard
Los Angeles County Ordinance No. 2025-0029, § Table 22.140.640-A, p. 10
- Source document
- Los Angeles County Ordinance No. 2025-0029
- Publisher
- Los Angeles County
- Document type
- Ordinance
- Source type
- Binding law
- Section
- Table 22.140.640-A, p. 10
- Source checked
- August 24, 2026
Source — Los Angeles County standard
Los Angeles County Ordinance No. 2025-0029, § Table 22.140.640-A, p. 10
- Source document
- Los Angeles County Ordinance No. 2025-0029
- Publisher
- Los Angeles County
- Document type
- Ordinance
- Source type
- Binding law
- Section
- Table 22.140.640-A, p. 10
- Source checked
- August 24, 2026
Source — Statewide standard
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66323(a)(4)(A)(iii)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66323(a)(4)(A)(iii)
- Source checked
- August 23, 2026
Source — Statewide standard
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66323(a)(4)(A)(ii)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66323(a)(4)(A)(ii)
- Source checked
- August 23, 2026
Source — Statewide standard
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66323(a)(2)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66323(a)(2)
- Source checked
- August 23, 2026
- Up to 2 count
Maximum junior ADUs allowed
Up to 1 countOne JADU is allowed per qualifying single-family residential lot.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Greatest number of junior ADUs permitted on the property.
When this applies
Applies when all of the following are true:
Property primary structure type is Single family
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66333(a)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66333(a)
- Source checked
- August 23, 2026
Property and zoning eligibility
Which lots, zones and existing homes qualify.3 rules · Statewide standard · Effective
ADU allowed on this property
AllowedADUs are authorized on lots with a proposed or existing primary residence in qualifying residential or mixed-use areas.
- Note: Conditions apply
Explanation
Whether an ADU may be built on the property at all, before any other standard applies.
When this applies
Applies when all of the following are true:
Property primary structure type is one of Single family, Multifamily, Mixed use
Part of Statewide, published by California.
Sources (2)
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66313(a)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66313(a)
- Source checked
- August 23, 2026
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(2)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(2)
- Source checked
- August 23, 2026
ADU allowed in this zone
AllowedAn ADU is a residential use consistent with the lot's existing general-plan and zoning designations where the lot allows single-family or multifamily residential use.
Explanation
Whether the zoning district permits ADUs.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(c)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(c)
- Source checked
- August 23, 2026
Existing primary dwelling required
Not requiredA primary dwelling may be proposed rather than already built.
- Note: Conditions apply
Explanation
Whether a primary dwelling must already exist, or be built concurrently, before an ADU is permitted.
When this applies
Applies when all of the following are true:
Application includes proposed primary dwelling is yes
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(2)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(2)
- Source checked
- August 23, 2026
Size and floor area
Floor-area limits and overall dimensions.5 rules
Maximum ADU size
Up to 1,200 sqftA detached ADU may not exceed 1,200 square feet under the statewide baseline.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Greatest permitted floor area of the ADU.
When this applies
Applies when all of the following are true:
Project unit type is Detached adu
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(5)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(5)
- Source checked
- August 23, 2026
Guaranteed minimum size
- At least 150 sqft
An ADU must contain at least 150 square feet of floor area.
- Set by: Los Angeles County standard
- At least 800 sqft
Local size and related development standards must allow at least an 800-square-foot ADU with four-foot side and rear setbacks.
- Set by: Statewide standard
- In force from: Effective
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Los Angeles County standard
Floor area that must be permitted regardless of other size limits.
Part of Los Angeles County Local Rules, published by Los Angeles County.
Explanation — Statewide standard
Floor area that must be permitted regardless of other size limits.
Part of Statewide, published by California.
Source — Los Angeles County standard
Los Angeles County Ordinance No. 2025-0029, § § 22.140.640.G.1.a.i, p. 11
- Source document
- Los Angeles County Ordinance No. 2025-0029
- Publisher
- Los Angeles County
- Document type
- Ordinance
- Source type
- Binding law
- Section
- § 22.140.640.G.1.a.i, p. 11
- Source checked
- August 24, 2026
Source — Statewide standard
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66321(b)(3)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66321(b)(3)
- Source checked
- August 23, 2026
- At least 150 sqft
Maximum size as a share of the primary dwelling
Up to 50 percentAn attached ADU on a lot with an existing primary dwelling may not exceed half of the primary dwelling's floor area.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Greatest permitted ADU floor area expressed as a percentage of the primary dwelling.
When this applies
Applies when all of the following are true:
Project unit type is Attached adu
Property has existing primary dwelling is yes
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(4)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(4)
- Source checked
- August 23, 2026
Size threshold for additional bedrooms
At least 1,000 sqftA local maximum size rule may not be lower than 1,000 square feet for an ADU with more than one bedroom.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Floor area at which a different bedroom limit or size allowance takes effect.
When this applies
Applies when all of the following are true:
Project bedrooms is more than 1
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66321(b)(2)(B)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66321(b)(2)(B)
- Source checked
- August 23, 2026
Height and stories
How tall an ADU may be, and how many storeys.7 rules
Maximum height
- Up to 16 ft
A detached ADU on a lot containing existing multifamily dwelling structures is limited to 16 feet under the general County standard.
- Set by: Los Angeles County standard
- Note: Conditions apply
- Up to 25 ft
The general County height limit is 25 feet, subject to applicable plan-area, community-standards-district, specific-plan, scenic-resource, and State-exempt standards.
- Set by: Los Angeles County standard
- Note: Conditions apply
- Up to 25 ft
An attached ADU must be allowed up to 25 feet or the primary dwelling's applicable zoning height, whichever is lower; it need not exceed two stories.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
- Up to 16 ft
A local height limit must allow at least 16 feet for a detached ADU, subject to more favorable transit and multifamily rules.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Los Angeles County standard
Greatest permitted height of the ADU.
When this applies
Applies when all of the following are true:
Project unit type is Detached adu
Property primary structure type is Multifamily
Property has existing primary dwelling is yes
Part of Los Angeles County Local Rules, published by Los Angeles County.
Explanation — Los Angeles County standard
Greatest permitted height of the ADU.
When this applies
Applies when all of the following are true:
Project unit type is one of Attached adu, Detached adu
Property primary structure type is not Multifamily
Part of Los Angeles County Local Rules, published by Los Angeles County.
Explanation — Statewide standard
Greatest permitted height of the ADU.
When this applies
Applies when all of the following are true:
Project unit type is Attached adu
Part of Statewide, published by California.
Explanation — Statewide standard
Greatest permitted height of the ADU.
When this applies
Applies when all of the following are true:
Project unit type is Detached adu
Part of Statewide, published by California.
Source — Los Angeles County standard
Los Angeles County Ordinance No. 2025-0029, § § 22.140.640.G.1.b.ii, p. 12
- Source document
- Los Angeles County Ordinance No. 2025-0029
- Publisher
- Los Angeles County
- Document type
- Ordinance
- Source type
- Binding law
- Section
- § 22.140.640.G.1.b.ii, p. 12
- Source checked
- August 24, 2026
Source — Los Angeles County standard
Los Angeles County Ordinance No. 2025-0029, § § 22.140.640.G.1.b.i, p. 12
- Source document
- Los Angeles County Ordinance No. 2025-0029
- Publisher
- Los Angeles County
- Document type
- Ordinance
- Source type
- Binding law
- Section
- § 22.140.640.G.1.b.i, p. 12
- Source checked
- August 24, 2026
Source — Statewide standard
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66321(b)(4)(D)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66321(b)(4)(D)
- Source checked
- August 23, 2026
Source — Statewide standard
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66321(b)(4)(A)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66321(b)(4)(A)
- Source checked
- August 23, 2026
- Up to 16 ft
Additional height allowed for roof pitch
2 ftA detached ADU receives two additional feet where needed for a roof pitch aligned with the primary dwelling.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Extra height permitted to accommodate a pitched roof.
When this applies
Applies when all of the following are true:
Project unit type is Detached adu
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66321(b)(4)(B)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66321(b)(4)(B)
- Source checked
- August 23, 2026
Maximum height near transit
Up to 18 ftA detached ADU within one-half mile walking distance of qualifying transit must be allowed to reach 18 feet, plus applicable roof-pitch height.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Greatest permitted height where the property is within a qualifying distance of transit.
When this applies
Applies when all of the following are true:
Project unit type is Detached adu
Property distance to transit ft is at most 2640
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66321(b)(4)(B)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66321(b)(4)(B)
- Source checked
- August 23, 2026
Maximum height on multifamily property
Up to 18 ftA detached ADU on a lot with an existing or proposed multistory multifamily dwelling must be allowed to reach 18 feet.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Greatest permitted height where the ADU is on a multifamily property.
When this applies
Applies when all of the following are true:
Property primary structure type is Multifamily
Project unit type is Detached adu
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66321(b)(4)(C)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66321(b)(4)(C)
- Source checked
- August 23, 2026
Setbacks and placement
Distance from property lines and from other buildings.3 rules · Statewide standard · Effective
Minimum side setback
At least 4 ftA local side setback may be no more than four feet for a new ADU not converted from an existing structure.
- Note: Conditions apply
Explanation
Least permitted distance from a side property line.
When this applies
Applies when all of the following are true:
Project construction type is one of Detached new, Attached new, Addition
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(7)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(7)
- Source checked
- August 23, 2026
Minimum rear setback
At least 4 ftA local rear setback may be no more than four feet for a new ADU not converted from an existing structure.
- Note: Conditions apply
Explanation
Least permitted distance from the rear property line.
When this applies
Applies when all of the following are true:
Project construction type is one of Detached new, Attached new, Addition
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(7)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(7)
- Source checked
- August 23, 2026
Existing structure setback exception
YesNo setback is required for an existing structure converted in place to an ADU.
- Note: Conditions apply
Explanation
Whether an existing structure converted to an ADU may keep its current setbacks.
When this applies
Applies when all of the following are true:
Project construction type is one of Interior conversion, Accessory structure conversion, Garage conversion
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(7)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(7)
- Source checked
- August 23, 2026
Parking
When parking has to be provided, and when it is excused.9 rules
Parking spaces required
- 0 spaces
No ADU parking is required outside a Very High Fire Hazard Severity Zone.
- Set by: Los Angeles County standard
- Note: Conditions apply
- 0 spaces
No additional parking may be required for a JADU.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
- Up to 1 spaces
ADU parking may not exceed one space per ADU or per bedroom, whichever is less; JADUs may not require additional parking.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Los Angeles County standard
Off-street parking spaces required for the ADU.
When this applies
Applies when all of the following are true:
Property fire hazard status is not Very high
Part of Los Angeles County Local Rules, published by Los Angeles County.
Explanation — Statewide standard
Off-street parking spaces required for the ADU.
When this applies
Applies when all of the following are true:
Application type is Jadu
Part of Statewide, published by California.
Explanation — Statewide standard
Off-street parking spaces required for the ADU.
When this applies
Applies when all of the following are true:
Application type is one of Adu, Adu and jadu
Part of Statewide, published by California.
Source — Los Angeles County standard
Los Angeles County Ordinance No. 2025-0029, § § 22.140.640.G.1.d.i, p. 16
- Source document
- Los Angeles County Ordinance No. 2025-0029
- Publisher
- Los Angeles County
- Document type
- Ordinance
- Source type
- Binding law
- Section
- § 22.140.640.G.1.d.i, p. 16
- Source checked
- August 24, 2026
Source — Statewide standard
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66334(a)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66334(a)
- Source checked
- August 23, 2026
Source — Statewide standard
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(10)(A)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(10)(A)
- Source checked
- August 23, 2026
- 0 spaces
Replacement parking required
Not requiredParking removed or converted for an ADU does not have to be replaced.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Whether parking removed to build the ADU must be replaced.
When this applies
Applies when all of the following are true:
Project parking removed is yes
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(11)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(11)
- Source checked
- August 23, 2026
Parking exemption near transit
YesNo ADU parking standard may be imposed within one-half mile walking distance of public transit.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Whether proximity to transit exempts the ADU from parking requirements.
When this applies
Applies when all of the following are true:
Property distance to transit ft is at most 2640
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66322(a)(1)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66322(a)(1)
- Source checked
- August 23, 2026
Parking exemption in a historic district
YesNo ADU parking standard may be imposed in an architecturally and historically significant historic district.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Whether location in a historic district exempts the ADU from parking requirements.
When this applies
Applies when all of the following are true:
Property overlays includes Historic district
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66322(a)(2)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66322(a)(2)
- Source checked
- August 23, 2026
Parking exemption where on-street permits are required
YesNo parking is required where on-street permits are required but are not offered to the ADU occupant.
- Set by: Los Angeles County standard
Explanation
Whether an on-street permit area exempts the ADU from parking requirements.
Part of Los Angeles County Local Rules, published by Los Angeles County.
Source
Los Angeles County Ordinance No. 2025-0029, § § 22.140.640.G.1.d.ii, p. 17
- Source document
- Los Angeles County Ordinance No. 2025-0029
- Publisher
- Los Angeles County
- Document type
- Ordinance
- Source type
- Binding law
- Section
- § 22.140.640.G.1.d.ii, p. 17
- Source checked
- August 24, 2026
Parking location restrictions
When required, parking may be located on a driveway or an area previously used as a driveway to a demolished or converted garage/carport, and may be tandem parking.Required parking may be driveway or tandem parking in specified circumstances.
- Set by: Los Angeles County standard
Explanation
Where required parking may or may not be placed, as stated by the source.
Part of Los Angeles County Local Rules, published by Los Angeles County.
Source
Los Angeles County Ordinance No. 2025-0029, § § 22.140.640.G.1.d.iv, p. 18
- Source document
- Los Angeles County Ordinance No. 2025-0029
- Publisher
- Los Angeles County
- Document type
- Ordinance
- Source type
- Binding law
- Section
- § 22.140.640.G.1.d.iv, p. 18
- Source checked
- August 24, 2026
Design requirements
Site and design standards an ADU has to meet.1 rule · Statewide standard · Effective
Passageway required
Not requiredA pedestrian passageway may not be required for an ADU.
Explanation
Whether a pedestrian passageway to the ADU is required.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(6)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(6)
- Source checked
- August 23, 2026
Fire and life safety
Sprinklers, access and other safety requirements.3 rules
Fire sprinklers required
Not requiredSprinklers cannot be required in an ADU or JADU if they are not required for the primary residence.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Whether fire sprinklers are required in the ADU.
When this applies
Applies when all of the following are true:
Property has sprinklers is no
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66323(d)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66323(d)
- Source checked
- August 23, 2026
Fire access required
RequiredCounty fire-access standards apply to ADUs.
- Set by: Los Angeles County standard
Explanation
Whether specific fire apparatus access or pathway standards apply.
Part of Los Angeles County Local Rules, published by Los Angeles County.
Source
Los Angeles County Building and Safety ADU and JADU Guidelines, § Fire Department Requirements, p. 2
- Source document
- Los Angeles County Building and Safety ADU and JADU Guidelines
- Publisher
- Los Angeles County
- Document type
- Ordinance
- Source type
- Official guidance
- Section
- Fire Department Requirements, p. 2
- Source checked
- August 24, 2026
Separate address required
Not requiredA JADU is not issued a separate address.
- Set by: Los Angeles County standard
- Note: Conditions apply
Explanation
Whether the ADU must be assigned its own street address.
When this applies
Applies when all of the following are true:
Project unit type is Jadu
Part of Los Angeles County Local Rules, published by Los Angeles County.
Source
Los Angeles County Building and Safety ADU and JADU Guidelines, § Electrical Requirements FAQ, p. 8
- Source document
- Los Angeles County Building and Safety ADU and JADU Guidelines
- Publisher
- Los Angeles County
- Document type
- Ordinance
- Source type
- Official guidance
- Section
- Electrical Requirements FAQ, p. 8
- Source checked
- August 24, 2026
Utilities and impact fees
Connections, meters and the charges that come with them.7 rules · Statewide standard · Effective
Separate utility meter required
Not requiredFor qualifying conversion ADUs and JADUs, a new or separate direct utility connection may not be required except with a new single-family dwelling or separate conveyance.
- Note: Conditions apply
Explanation
Whether the ADU must have its own utility meter.
When this applies
Applies when all of the following are true:
Project construction type is one of Interior conversion, Accessory structure conversion, Garage conversion
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66311.5(d)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66311.5(d)
- Source checked
- August 23, 2026
New utility connection required
Not requiredQualifying conversion ADUs and JADUs cannot be required to install a new direct utility connection, subject to statutory exceptions.
- Note: Conditions apply
Explanation
Whether a new utility connection, rather than a shared one, is required.
When this applies
Applies when all of the following are true:
Project construction type is one of Interior conversion, Accessory structure conversion, Garage conversion
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66311.5(d)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66311.5(d)
- Source checked
- August 23, 2026
Connection fee charged
Not requiredA related connection fee or capacity charge cannot be imposed on qualifying conversion ADUs and JADUs, subject to statutory exceptions.
- Note: Conditions apply
Explanation
Whether a utility connection fee or capacity charge applies.
When this applies
Applies when all of the following are true:
Project construction type is one of Interior conversion, Accessory structure conversion, Garage conversion
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66311.5(d)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66311.5(d)
- Source checked
- August 23, 2026
Septic review required
RequiredWhere a private sewage-disposal system is used, local-health-officer approval may be required.
- Note: Conditions apply
Explanation
Whether septic system review or approval is required.
When this applies
Applies when all of the following are true:
Property sewer type is Septic
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(9)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(9)
- Source checked
- August 23, 2026
Exempt from impact fees
YesA JADU of 500 square feet or less is exempt from impact fees.
- Note: Conditions apply
Explanation
Whether the ADU is exempt from development impact fees.
When this applies
Applies when all of the following are true:
Project unit type is Jadu
Project proposed size sqft is at most 500
Part of Statewide, published by California.
Explanation
Whether the ADU is exempt from development impact fees.
When this applies
Applies when all of the following are true:
Project unit type is one of Detached adu, Attached adu, Conversion adu
Project proposed size sqft is at most 750
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66311.5(c)(1)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66311.5(c)(1)
- Source checked
- August 23, 2026
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66311.5(c)(1)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66311.5(c)(1)
- Source checked
- August 23, 2026
School fees apply
NoAn ADU or JADU under 500 square feet is treated as construction that does not increase assessable space by 500 square feet for school-fee purposes.
- Note: Conditions apply
Explanation
Whether school district fees apply to the ADU.
When this applies
Applies when all of the following are true:
Project proposed size sqft is less than 500
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66311.5(c)(3)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66311.5(c)(3)
- Source checked
- August 23, 2026
Permits and review
How an application is reviewed, and the routes available.10 rules
Maximum period to determine application completeness
Up to 15 daysThe permitting agency must provide written completeness notice within 15 business days.
- Set by: Statewide standard
- In force from: Effective
Explanation
Longest period the agency may take to determine whether a submitted application is complete.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code §§ 66317(a)(2)(A), 66335(a)(2)(A)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code §§ 66317(a)(2)(A), 66335(a)(2)(A)
- Source checked
- August 23, 2026
Maximum period to decide a completed application
Up to 60 daysA completed ADU or JADU application on a lot with an existing qualifying dwelling must be approved or denied within 60 days; applicant-requested delay tolls the period.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Longest period the agency may take to approve or deny a completed application. Frequently scoped to lots with an existing dwelling; that condition belongs in the claim's applicability, not in this description.
When this applies
Applies when all of the following are true:
Property has existing primary dwelling is yes
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code §§ 66317(a)(3), 66335(a)(3)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code §§ 66317(a)(3), 66335(a)(3)
- Source checked
- August 23, 2026
Maximum period to review a resubmitted application
Up to 15 daysA resubmission addressing listed completeness items is subject to the same 15-business-day completeness timeline.
- Set by: Statewide standard
- In force from: Effective
Explanation
Longest period the agency may take to review an application resubmitted after a completeness or correction letter.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code §§ 66317(a)(2)(E), 66335(a)(2)(E)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code §§ 66317(a)(2)(E), 66335(a)(2)(E)
- Source checked
- August 23, 2026
Maximum period to determine an appeal
Up to 60 daysA final written determination on an ADU or JADU appeal is due within 60 business days after receipt of the written appeal.
- Set by: Statewide standard
- In force from: Effective
Explanation
Longest period the agency may take to issue a final written determination on a written appeal.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code §§ 66317(d)(2), 66335(e)(2)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code §§ 66317(d)(2), 66335(e)(2)
- Source checked
- August 23, 2026
Maximum period to respond to a state housing agency
Up to 30 daysA local agency has no more than 30 days to respond to HCD findings on a noncompliant ADU or JADU ordinance.
- Set by: Statewide standard
- In force from: Effective
Explanation
Longest period the jurisdiction may take to respond to a state housing agency letter or finding. A duty owed to the agency, not to an applicant.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code §§ 66326(b)(1), 66333.5(b)(1)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code §§ 66326(b)(1), 66333.5(b)(1)
- Source checked
- August 23, 2026
Maximum period to act on a coastal development permit
Up to 60 daysA completed coastal development permit application for an ADU must be approved or denied within 60 days, subject to the concurrent-primary-dwelling exception.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Longest period the agency may take to act on a coastal development permit application. Separate from the underlying ADU application timeline.
When this applies
Applies when all of the following are true:
Property overlays includes Coastal overlay
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66329(a)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66329(a)
- Source checked
- August 23, 2026
Ministerial review available
YesADU and JADU permits are reviewed ministerially without discretionary review or hearings.
- Set by: Statewide standard
- In force from: Effective
Explanation
Whether the application is reviewed ministerially, without discretionary hearings.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code §§ 66317(a)(1), 66335(a)(1)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code §§ 66317(a)(1), 66335(a)(1)
- Source checked
- August 23, 2026
Demolition delay applies
NoFor a detached garage replaced by an ADU, written notice or placarding for demolition cannot be required outside an architecturally and historically significant historic district.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Whether a demolition permit review or delay applies to the project.
When this applies
Applies when all of the following are true:
Property overlays does not include Historic district
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(f)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(f)
- Source checked
- August 23, 2026
Legalization of unpermitted ADUs available
YesAn unpermitted ADU or JADU built before January 1, 2020 has a statewide permit pathway, subject to health-and-safety exceptions.
- Set by: Statewide standard
- In force from: Effective
- Note: Conditions apply
Explanation
Whether an existing unpermitted ADU can be brought into compliance under a legalization pathway.
When this applies
Applies when all of the following are true:
Project construction type is Legalization
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66311.7(a)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66311.7(a)
- Source checked
- August 23, 2026
Historic review required
Not requiredA County certificate of appropriateness is not required for construction of an ADU under the ADU ordinance.
- Set by: Los Angeles County standard
- Note: Conditions apply
Explanation
Whether historic or design review is required.
When this applies
Applies when all of the following are true:
Property historic status is one of Local, State, National, Contributing
Part of Los Angeles County Local Rules, published by Los Angeles County.
Source
Los Angeles County Ordinance No. 2025-0029, § § 22.124.140.B.5, p. 5
- Source document
- Los Angeles County Ordinance No. 2025-0029
- Publisher
- Los Angeles County
- Document type
- Ordinance
- Source type
- Binding law
- Section
- § 22.124.140.B.5, p. 5
- Source checked
- August 24, 2026
Occupancy and rentals
Who may live in an ADU, and how it may be rented or sold.4 rules · Statewide standard · Effective
Minimum rental term
At least 31 daysADU and JADU rentals must be for terms longer than 30 days.
Explanation
Shortest rental term permitted for the ADU.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66333(g)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66333(g)
- Source checked
- August 23, 2026
Short-term rental allowed
Not allowedRentals of 30 days or fewer are not allowed under the statewide ADU/JADU rules.
Explanation
Whether the ADU may be used as a short-term rental.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code §§ 66315, 66333(g)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code §§ 66315, 66333(g)
- Source checked
- August 23, 2026
Separate sale allowed
Not allowedAn ADU or JADU generally may not be sold separately from the primary residence, subject to a statutory separate-conveyance exception not captured by this broad rule.
- Note: Conditions apply
Explanation
Whether the ADU may be sold separately from the primary dwelling.
When this applies
Applies when all of the following are true:
Project separate sale intended is yes
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(1)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66314(d)(1)
- Source checked
- August 23, 2026
Deed restriction required
RequiredA JADU requires a recorded deed restriction.
- Note: Conditions apply
Explanation
Whether a recorded deed restriction or covenant is required.
When this applies
Applies when all of the following are true:
Application type is one of Jadu, Adu and jadu
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66333(c)
- Source document
- California Government Code, Title 7, Division 1, Chapter 13
- Publisher
- California
- Document type
- ADU webpage
- Source type
- Binding law
- Section
- Gov. Code § 66333(c)
- Source checked
- August 23, 2026
Who to contact in Los Angeles County
These agencies decide what is permitted here. Contacting them does not guarantee approval, but they can confirm what applies to a specific parcel.
Los Angeles County Department of Regional Planning
Handles planning and environmental health.
320 West Temple Street, Los Angeles, CA 90012
Los Angeles County Department of Public Works, Building and Safety Division
Handles building and permits.
900 S. Fremont Avenue, Alhambra, CA 91803
California Coastal Commission
Handles coastal review.
7575 Metropolitan Drive, Suite 103, San Diego, CA 92108-4421
Sources
The rules above were recorded from these official documents. Each opens on the publisher's own site.
- California Government Code, Title 7, Division 1, Chapter 13 — Gov. Code § 66313(a) (opens in a new tab)
- Los Angeles County Ordinance No. 2025-0029 — Table 22.140.640-A, p. 10 (opens in a new tab)
- Los Angeles County Building and Safety ADU and JADU Guidelines — Fire Department Requirements, p. 2 (opens in a new tab)
ADUDesk summarises recorded rules for informational purposes and may not include every requirement. Confirm current requirements with the responsible planning agency before making design, purchase, or permit decisions.
About this information
Dates, versions and how rules are recorded
Rules are recorded from official sources and each one links to the document it came from. A source check confirms the document was retrieved and read; it is not a legal review, and the record may not cover every requirement that applies to a property or project.
- Report as of
- The date the rules on this page were resolved for.
- Jurisdiction record reviewed
- Not recordedWhen this jurisdiction's record was last checked. Not a legal review.
Statewide
Published by California
- Rule-set effective from
- Published
- Statewide rules reviewed
- A staff check of this rule set against its sources.
What changed in this version: Initial
Los Angeles County Local Rules
Published by Los Angeles County
- Rule-set effective from
- Published
- Local rules reviewed
- A staff check of this rule set against its sources.
What changed in this version: Created from V2 research draft #5 (run #21).
Planning an ADU in Los Angeles County?
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